Question

Cine mă ajuta la calcule cu aranjamente

Answer 1

Răspuns:

Explicație pas cu pas:

Answer 2

$\it A_8^4=\dfrac{8!}{(8-4)!}=\dfrac{8!}{4!}=\dfrac{4!\cdot5\cdot6\cdot7\cdot8}{4!}=1680$

$\it A_5^7=\dfrac{7!}{2!}=3\cdot4\cdot5\cdot6\cdot7=2520$